Added _get_copied_node() from sfw_tbase.js, and used it in put_row_into_target() to preserve the result for later reference.  Also filtered out merged results when looking a result into which an update can be copied.
Added _get_copied_node() from sfw_tbase.js, and used it in put_row_into_target() to preserve the result for later reference.  Also filtered out merged results when looking a result into which an update can be copied.

cjungmann/schemafw,cjungmann/schemafw,cjungmann/schemafw,cjungmann/schemafw,cjungmann/schemafw